Months/weeks can be deceiving. Someone can edit for 20 hours a week and finish an 80-hour AMV up in a month, while someone else who only can get 5 hours a week in is going to take "longer." Heck, some people have spent years on videos, and sometimes it shows, sometimes not.

Of course, the chances of creating something that LOOKS slapped together are much higher if you actually do indeed slap it together. On the other hand, if you spend the time to tweak and adjust everything, it's hopefully going to show. So, when in doubt, it's worthwhile to take your time.

I think it depends on the person. For me, it can take maybe 2 or 3 days. Awhile ago it used to take me a week or maybe even two weeks to finish one. But, that was because I was very lazy with making them, I still am, but the time has shortened.

It really depends on how much time/effort your going to put in every day. The more you edit, the faster you'll finish of course. Take your time though, I know in my case I have a deadline to meet at the end of the month. With that in mind I have been editing everyday, putting aside time for my AMV and finishing while I'm still at ease. It is common to believe that your ideas are bigger than what your going to be putting on the timeline. And that's true for the most part.

Generally for me, the shortest edit I have had was 2 weeks and the longest was 3-4 months.